Possible causes – Failed or missing gas cap– Failed Fuel Tank Pressure (FTP) sensor– Line/system blocked or kinked Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1455 FORD Description Evaporative Emission Control (EVAP) monitor enabled and Engine

Possible causes – Faulty Camshaft Position Sensor – Synchronize Assembly not properly installed.– Verify the cam sensor is synchronized– Faulty Powertrain Control Module (PCM)– Verify input sensor parameters are correct Tech notes Replacing the Camshaft Position Sensor (CMP) usually takes

Possible causes – Faulty Differential Pressure Feedback Electronic (DPFE) sensor (EGR pressure sensor)– Plugged or damaged EGR tube– Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted– Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection Symptoms

Possible causes – Faulty Differential Pressure Feedback Electronic (DPFE) sensor– Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted– Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection Tech notes There is a factory service bulletin for

Possible causes – Faulty Differential Pressure Feedback Electronic (DPFE) sensor– Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted– Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection Tech notes Sensor replacement procedure 2001 Ford Focus: Note:

Possible causes – Faulty Differential Pressure Feedback Electronic (DPFE) sensor– Differential Pressure Feedback Electronic (DPFE) sensor harness is open or shorted– Differential Pressure Feedback Electronic (DPFE) sensor circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon

Possible causes – Faulty electric throttle control actuator (TP sensor 1 and 2)– Throttle Position Sensor harness is open or shorted– Throttle Position Sensor circuit poor connection– Faulty accelerator pedal position sensor Symptoms – Engine Light ON (or Service Engine

Possible causes – Faulty Engine Coolant Temperature (ECT) sensor– Low engine coolant level– Engine Coolant Temperature (ECT) sensor harness is open or shorted– Engine Coolant Temperature (ECT) sensor electrical circuit poor connection– Faulty engine coolant thermostat Symptoms – Engine Light

Possible causes – Faulty Engine Coolant Temperature (ECT) sensor– Low engine coolant level– Engine Coolant Temperature (ECT) sensor harness is open or shorted– Engine Coolant Temperature (ECT) sensor electrical circuit poor connection– Faulty engine coolant thermostat Symptoms – Engine Light

Possible causes – Faulty Exhaust Gas Recirculation (EGR) valve– Faulty Exhaust Gas Recirculation (EGR) valve solenoid– Exhaust Gas Recirculation (EGR) valve carbon blockage Symptoms – Engine Light ON (or Service Engine Soon Warning Light) FORD Technical Service Bulletins for P1404

Possible causes – Faulty Front Heated Oxygen Sensor Bank 1– Front Heated Oxygen Sensor Bank 1 harness is open or shorted– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection– Inappropriate fuel pressure– Faulty fuel injectors– Intake air leaks

Possible causes – Faulty Front Heated Oxygen Sensor Bank 1– Front Heated Oxygen Sensor Bank 1 harness is open or shorted– Front Heated Oxygen Sensor Bank 1 circuit poor electrical connection– Inappropriate fuel pressure– Faulty fuel injectors– Intake air leaks

Possible causes – Faulty Fuel Pump Drive Module (FPDM)– FPDM harness is open or shorted– FPDM circuit poor electrical connection– Faulty Powertrain Control Module (PCM) Tech notes Note: For LS6/LS8 and Thunderbird, the FPDM functions are incorporated in the Rear

Possible causes – Faulty Fuel Pump Driver Module (FPDM)– Fuel Pump Driver Module (FPDM) harness is open or shorted– Fuel Pump Driver Module (FPDM) circuit poor electrical connection– Faulty fuel pump When is the code detected? Fuel pump driver module

Possible causes – Faulty Heated Oxygen Sensor– Heated Oxygen Sensor harness is open or shorted– Heated Oxygen Sensor circuit poor electrical connection– Exhaust leaks– Contaminated Heated Oxygen Sensor Tech notes Before replacing the Heated Oxygen Sensor, inspect the sensor connector

Possible causes – Faulty Heated Oxygen Sensor– Heated Oxygen Sensor harness is open or shorted– Heated Oxygen Sensor circuit poor electrical connection– Exhaust leaks– Contaminated Heated Oxygen Sensor Tech notes Before replacing the Heated Oxygen Sensor, inspect the sensor connector

Possible causes – Faulty Heated Oxygen Sensor– Heated Oxygen Sensor harness is open or shorted– Heated Oxygen Sensor circuit poor electrical connection– Exhaust leaks– Contaminated Heated Oxygen Sensor Tech notes Before replacing the Heated Oxygen Sensor, inspect the sensor connector

Possible causes – Faulty Heated Oxygen Sensor– Heated Oxygen Sensor harness is open or shorted– Heated Oxygen Sensor circuit poor electrical connection– Exhaust leaks– Contaminated Heated Oxygen Sensor Tech notes Before replacing the Heated Oxygen Sensor, inspect the sensor connector

Possible causes – Faulty HO2S Bank 1 Sensor 1– HO2S Bank 1 Sensor 1 harness is open or shorted– HO2S Bank 1 Sensor 1 circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light)

Possible causes – Faulty HO2S Bank 1 Sensor 2– HO2S Bank 1 Sensor 2 harness is open or shorted– HO2S Bank 1 Sensor 2 circuit poor electrical connection When is the code detected? The test fails if the Powertrain Control